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1by Thomas, Bruce I.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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2by Thomas, Bruce I.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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Government Document eBook -
3by Thorne, Robert L.“...Report of investigations (United States. Bureau of Mines) ;...”
Published 1948
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Government Document eBook